That was told before by DemonHades, if you're on OFW 3.56 ou + you need a hardware flasher to install this JFW DH MA 3.56 !!
if you're on OFW 3.56, yes you need a hardware flahser (at least they made a progress with this story)

If you're on CFW/OFW 3.55 or less, here you can install this MA 3.56 without a hardware flasher, just like any other OFW/CFW PUP from XMB or recovery menu but, once installer downgrade will be impossible without a hardware flasher !!!